Cargo vessel.



Notagzm.

W. DOXPORD. CARGO VESSEL.

APPLICATION FILED APR. 3,1907.

I Ewan fl izw PATENTED fiEPT. 8,-1908.

WILLIAM DOXFORD, 0F SUNDERLAND, ENGLAND.

CARGO VESSEL.

Specification of Letters intent.

Patented Sept. 8, 1908.

Application filed April 3, 1967. Serial No. 366,156

To all whmr it may concern:

Be it known that I, WILLIAM Doxronn, a sub ect of the King of England, residing in Sundorlnnd, in England, have invented oer tnin new and. useful Improvements in Cargo Vessels, of which the following is a specification.

This invention relates to improvements in sca-going for bulk cargoes and is applicable to the well known forms of vessel. and

porticularly to vessels of the turret type.

In vessels which carry an easily shifting bulk cargo such as grain, central bulkheads, by statutory requirement, have to be fitted grain-tight to minimize the transverse movement of the center of gravity of the cargo during the process of loading or discharging when the vessel may take transverse inclina-.

tions, or in. the case of stranding where jettisoning of the cargo has to be resorted to or by heavy rolling st In all such cases it is well known that a central division is essential to the safety of the vessel, as the grain being almost liquid in its movements, shifts with any transverse inclination of the vessel. Should the central bulkhead be omitted, on a transverse inclination of the vessel, the transverse movement of the center of gravity of the cargo being greater than that of the center of buoyancy, the ship would be unstable and disaster would result. It is desirobe for many reasons to dispense with the central bulkhead, but under the existing designs it is essential that it should be fitted.

According to this invention in sea-going vessels for bulk cargoes, inner upright walls are fitted some distance from the hull and thebottom of the hold is carried as close to the outer bottom shell as loading regulations for such goods will permit, the whole bei 21g so erthnt when the vessel is transverse y inclined the weight of the cargo and the buoysncy en .te restoring couple. The spaces between the cargo hold andthe outer shell at the sides and at the bottom may be used either for drainage or for Water ballast as may he desired, and. when the vessel is loaded with cargo the sid spaces will not as buoyenc r tanks as in the case of lifehoats.

The accompanying drawing is a is'gram representing: the application of this invention to one of Der-(lord's turret vessels.

The line A represents the hull of the vessel; the line 13 represents the bottom of the hold in the existing arrangement. The line C represents the position oi the cargo when the vessel is partially filled and is upright:

The line D represents the position of the same quantity of cargo when the vessel is transversely inclined; the point C represents the center of gravity of" the cargo .in the existing arrangement, and the point 0 represents the position of the center of gravity of the cargo when displaced. The point E represents the position of the center of buoyancy when the vessel is upright and the point E represents the position of the center of buoyancy when the vessel is displaced.

in carrying out the invention, upright inner walls F are fitted at some distance from the hull and the bottom Gof the hold is carried down .as near the bottom of the vessel its possible. in this arrangement the line H represents the level of the same quantity of cargo as before when the vessel is u right. The line J represents the level of tie cargo when displaced. The point H represents the center of gravity of the cargo when the vessel is upright and the point H represents the center of gravity of the cargo when displaced. It will be seen from the disgrmu that while under the existing or rnngcment the sctionof gravity on the cargo artingut C" and the buoyancy acting at E produce a cepsizing couple, in the new ar rongeiucut the action of gravity on the cargo acting at ii and the buoyancy acting at ill? form n restoring couple. By this or rangement the capacity of the cargo space is retained as in the ordinary existing plans, but the trensverse movement of the grain is restricted within the inner wells so that the movement of the center oi gravity is not so great :is that of the center of buoyancy, and the stability of the vessel is retained in all conditions of loading cnddischerging and in a see way.

\ 1 sin swore that it has been proposed. to

provide water ballast or other tanks at the sides of sea-going vessels, but this does not constitute the novel feature of the present invention.

it is to he understood that the details of honstruction and arrangement may be varied withoutdcpsrting from this invention.

Whotl claim as my invention and desire to secure by Letters latent is r in a vessel for cesily'shiiting bulk cargoes, the combination of the hull. comprising side walls and an outer bottom shell,-inner 1: right walls fitted some distance from t e hull and a hold bottom. fitted closeto the Bottom shell, whereby when the Vessel is transversely inclined the transverse movement of s partlal cargo W111 be restrlcted and the movement 01' lts cent-er cf gravity retained.

In testimony whereof I have signed my name to this specification in the presence 0% two subscribing Witnesses.

- WILLIAM DOXFOETL Witnesses:

EDMUND C. THOMPSON, ROBERT YOUNGS. 

